Is it ever too late to change someone?

I have some advice to give, but I'm not sure you are going to like what I have to say. Controlling behavior is the first red flag in a relationship. Anytime a boyfriend or girlfriend needs to know where you are at all times, what you're doing, who you're with, and every decision that you make flags problems down the road. Usually this behavior doesn't become violent until after marriage when you are "secure" under his control. The fact that he hit you is unacceptable and should NOT be tolerated. You can not let yourself believe that it is a once in a life time event. It WILL happen again. Maybe not in the next few weeks or even in the next year, but you said yourself he has a lot of anger and his method of releasing it involves you and physical abuse. You cannot allow yourself to remain with this man. Do not fool yourself into believing that things will change, I have had far too many friends that have convinced themselves of this and now have much bigger problems. I also have family members who married their significant other even though there were signs of controlling behavior whilst dating. These spouses became abusive and angry a few years into the marriage and caused heart break, and pain that was not necessary. Once again, this advice is very hard to follow, but I would suggest breaking it off as soon as you can. If you're worried about the wedding and everything being planned, don't be. You're family and friends want whats best for you, not a failed marriage and an abused friend/family member. Please, I promise you there is someone out there that can show you love without manipulating and hurting you. Best of luck, I will be praying for you.